| Basics of ColocationServer colocation is
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| | used. After any changes have been made to
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| usually for those who own their own
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| | the LILO configuration remember to run "
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| server hardware and require complete
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| | sbin/lilo -v" and ensure there are no
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| control over the server configuration.
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| | errors.Also make sure the kernel "works"
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| Colocation specialists will house and
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| | properly with the hardware. This is
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| connect a server you own, to a fast
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| | especially true if have compiled the
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| internet connection, usually in a secure
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| | kernel yourself or are using specialist
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| datacentre, with 24/7 support.It is
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| | hardware.Make sure the server "Auto
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| important to choose a colocation provider
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| | Powers" onMost colocation facilities
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| that either has their own data center or
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| | provide an auto power cycler from a web
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| has a presence in one of the leading
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| | interface. However this can fail if the
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| "data hotels." World Class data centres
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| | machine does not auto power back up
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| are located in major industrial cities
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| | (requiring the intervention of a techie).
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| (New York, London, Frankfurt for
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| | Most server BIOS's are equipped with
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| example). Here they are able to take
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| | either "OFF", "LAST STATE" or "ALWAYS
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| advantage of the convergence of high
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| | ON". In this case you will require
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| capacity network connectivity that occurs
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| | "ALWAYS ON." it is possible to hack
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| in a major commercial centre. For
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| | cheaper ATX motherboards to be "ALWAYS
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| instance fibre, and metrolinks and ease
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| | ON" but it is better to consider a more
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| of connection to major Points of Presence
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| | expensive motherboard.Properly Configured
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| (POPS) to the major telco's. For this
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| | NetworkMake sure you configure the
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| reason only a very few of the leading
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| | network addresses, DNS server and
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| ISP's or colocation specialist operate
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| | gateways properly prior to delivery of
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| their own dedicated centre's due to the
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| | the dedicated server. This information
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| costs of providing remote connectivity,
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| | will have been provided in advance by the
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| redundant power sources, air conditioning
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| | colocation provider. Also make sure you
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| and filtered clean air.Also not all
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| | can get back into the server remotely by
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| internet connections are equal. You
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| | having the SSHD daemon running (telnet is
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| really need to enquire if your colocation
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| | not secure).OpenSSH is shipped with all
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| specialist is "multihomed" using the BGP
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| | the main Linux distributions. You might
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| protocol by having at least two
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| | wish to consider configuring SSH (usually
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| connections to Tier One providers. Tier
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| | done in /etc/sshd/sshd_config) to work
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| One providers are very large ISP's or
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| | with Protocol2 only, disable root logins
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| Telco's who operate their own fibre links
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| | (or only allow public key exchanges with
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| and networks without having to operate
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| | the `without-password` option) and to
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| traffic (or transit) over another ISP's
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| | turn off X11 forwarding as this is not
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| network. An example of a Tier One
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| | required on a production server.Many
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| provider would be Level3
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| | servers have multiple ethernet
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| communications.In addition to Tier One
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| | connectors, so it an be helpful, if you
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| connections, the colocation specialist
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| | are not using the second interface to
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| should have peering arrangement's at
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| | either mask it off with tape or label the
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| major exchange point's such as LINX. A
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| | correct ethernet device.
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| peering point is where a number of ISP's
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| | Set up a Serial ConsoleThis is sometimes
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| arrange to "meet up" to exchange traffic
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| | called "out of band" management. Quite
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| between each other rather than pay for
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| | often a colocation provider will have a
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| transit over someone else's network. In a
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| | serial terminal on site. This is
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| way they are "cutting out the middleman!"
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| | basically a server itself but with loads
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| This not only improves redundancy but
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| | of serial ports. This enables you to
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| also reduces latency; people will be able
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| | connect to your server if the network has
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| to access the websites and content hosted
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| | failed to your server for any reason.The
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| on your colocated server much faster if
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| | most common serial port settings are 9600
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| you colo host is well peered.Quite often
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| | 8n1 (we do not recommend running it a
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| a web host or Colocation ISP will
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| | faster speed). If you are running a Red
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| negotiate many peering arrangements with
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| | Hat Linux server serial console access is
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| other ISP's with whom they are exchanging
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| | usually configured in "/etc/inittab." Try
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| a lot of traffic. Not only does this give
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| | inserting the line
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| them more resilience, but it also reduces
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| | below:co:23456:respawn:/sbin/agetty ttyS0
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| their own transit costs with the Tier One
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| | 9600 vt100Cooling ConsiderationsServers
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| providers enabling them to offer more
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| | run pretty hot mainly due to modern
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| competitive data transfer pricing.Latency
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| | processors. Even in a fully air
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| is particularly important when it comes
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| | conditioned environment. It will pay you
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| to game server hosting and colocation.
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| | look into cooling. A lot will depend on
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| Quite often an ISP specialising in games
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| | rack density however this is one more
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| hosting will give you an IP address for
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| | reason why you should consider a rack
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| you to test ping times and carry out
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| | optimised server, as the air cooling in a
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| traceroutes.Hardware ChoicesServer
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| | colocated environment should have been
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| housing costs in London or New York can
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| | taken into consideration. You can also
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| be expensive. Not suprisingly your
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| | familiarise with the chipset architecture
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| hardware should be "rack optimized."
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| | of your motherboard and consider setting
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| Colocation is usually priced "per U." A
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| | up "sensors." You can then monitor the
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| "U" is 1.75 inches (or 4.44 cms). So rack
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| | temperature of your CPU and motherboard
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| servers, unlike desktop machines are long
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| | and graph it using MRTG.
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| and flat. Data Centre's also employ
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| | Cheap Colocation ProvidersWell apart
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| different types Rack Cabinets which are
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| | from us that is! However the following
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| typically 42U in height, enough to house
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| | London based colocation providers come
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| 42 1U servers though some of this space
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| | highly recommended. In other words, they
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| is used to accomodate switches, cabling.
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| | are in demand, know what they are doing
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| Often some space is left free to allow
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| | and possess "clue."Bogons - - Based in
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| for efficient air distribution in the
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| | Telehouse, but they may only usually Sun
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| cabinet.It's often worth liasing with
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| | Netra servers.Black Cat Networks - -
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| your colo specialists over the choice of
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| | Based in Redbus Harbour Exchange.Jump
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| the physical hardware and especially the
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| | Networks - - Also based in Telehouse
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| case and rack mounting. The colocation
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| | North, Docklands.Additional ThoughtsYou
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| specialist will know which brands work in
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| | may wish to consider disc or hard drive
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| their racks. Personally I have found Dell
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| | redundancy. Although the "MTF" or Mean
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| Rack Optimized Servers and rail kits the
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| | Time to Failure" quoted by hard drive
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| quickest and easiest to rail up.So you
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| | manufacturers is impressive, hard drive
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| have decided on the hardware, and you are
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| | failure, especially IDE failure happens
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| about to ship your server to the remote
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| | depressingly often. With advent of S-ATA
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| colocation data centre. Bear in mind your
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| | drives there is really no excuse,
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| server will shortly be hundreds of miles
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| | expecially if your are on a budget. You
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| away, indeed if you are in the USA, it
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| | should consider cheap S-ATA drives (if
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| might even be few hours flight away so
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| | you cannot afford SCSI) with Linux
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| there are a few technical points to
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| | software RAID. Modern Linux distributions
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| consider before the machine is boxed,
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| | come with tools to administer and monitor
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| shipped and colocated.Make sure the
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| | the performance of software RAID
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| Operating System rebootsAll colocated
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| | arrays.It can be helpful to duty
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| dedicated servers run "headless." This
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| | technicians if all the main power lights
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| means without the use of a keyboard or
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| | are working. The power light, hard drive
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| monitor attached. Therefore you will need
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| | activity light and network light can be
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| to ensure that the servers gets past the
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| | very useful. It goes without saying that
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| BIOS screen and boots the desired kernel
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| | the server should be correctly labelled
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| without having to press any keys. It
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| | at the front with it's hostname and IP
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| might be possible to set the BIOS on your
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| | address so it can be identified
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| dedicated server to stop on "no
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| | quickly.Paul Lee has over six years
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| errors."If your are running Linux the
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| | experience in the web hosting industry
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| kernel you will need to ensure the
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| | and was formerly Senior System
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| correct kernel is booted without
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| | Administrator with Limited. He currently
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| intervention. This is usually determined
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| | lives and works in London and runs his
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| by the configuration on /etc/grub.conf if
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| | own consultancy and hosting company
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| the GRUB boot loader is used, or /etc
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| | Weycrest.
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| lilo.conf if the LILO boot loader is
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